Exchange Server Database Reseeding

M AService Manager
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Most Valuable Expert2017 and 2020.
O365, Exchange Server,Windows Server, Active Directory, Virtualization, Teams and Email Migration Expert.
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The following article will helps you reseed the failed  database copy
When we are dealing with Exchange server DAG you may encounter issues with database copies. The cause in most cases will be storage related, though there could be other reasons as well.
The following command shows you the database copies health.
Get-MailboxDatabaseCopyStatus *

Before going to the next step of fixing the failed database copy ensure there is no issue with the drive e.g. Database drive failure/RAID failure or RAID rebuilding at the time of failure. And Run the following command to see the replication health.
Test-ReplicationHealth -identity SERVERNAME



Reseed the database.

First, suspend the failed database copy.

Suspend-MailboxDatabaseCopy DB01\MBX02

Then update the database with DeleteExistingFiles switch. If the server still have the old files will delete the files in the destination and seed again from scratch.

Update-MailboxDatabaseCopy DB01\MBX02 -DeleteExistingFiles

By default, it will reseed from the active server. If your active server is at a remote location and if you have another database copy in the same site, it is better to seed from the nearby server by using the SourceServer switch. The following command will be used as per the above databases:

Update-MailboxDatabaseCopy DB01\MBX02 -SourceServer MBX01 -DeleteExistingFiles

The time to update the database copy will depend on the size of the database.
Once the database is updated, run the same command you ran above to check the database copy status. i.e. the following command. You can see your database copy is reseeded and healthy.
Get-MailboxDatabaseCopyStatus *

Thanks for reading my article.

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M AService Manager
CERTIFIED EXPERT
Most Valuable Expert2017 and 2020.
O365, Exchange Server,Windows Server, Active Directory, Virtualization, Teams and Email Migration Expert.

Comments (2)

Amit SinghCloud Security Engineer
Distinguished Expert 2023

Commented:
Nice Article. Refer this link for more information about the process:
https://www.stellarinfo.com/article/reseed-a-failed-database-copy-in-exchange-server.php

M AService Manager
CERTIFIED EXPERT
Most Valuable Expert 2020
Most Valuable Expert 2017

Author

Commented:
Thanks and noted your reference article.
Cheers

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